Just two minor corrections: "¿Cuál es tu dialecto favorito del español?" ("dialecto español" could be "Spanish dialect" or "dialect from Spain [of any language]". And there is no Argentine Spanish, you probably refer to Rioplatense Spanish, the most spoken dialect in Argentina and Uruguay. But many Argentinians speak Andean Spanish and other dialects.

All people in Uruguay speak Rioplatense (excepting some speakers or Portuñol, "Portuspanish", in the North) and more than half Argentine people speak it. Younger people use sh, a female and upper-class feature some decades ago, older people prefer zh.